Process of annealing metal plates.



No. 727,787. PATENTED MAY 12, 1903;

. v M. 1). GRIMM. PROCESS OF ANNEALING METAL PLATES.

v APPLIOATION FILED OUT. 6; 1992.

' N0 MODEL.

No. fewer.

UNHED STATES v fiatentea May 12, 1903;

PATENT QFFICE.

PROCESS OF ANNEALING METALIPLATES.

SPECIFICATION forming part of Letters Patent No. 727,787, dated May 12, 1903.

Application filed October 6, 1902. Serial No. 126,137. No specimens.)

T0 at whom it may concern:

Be it known that I, MILLER D. GRIMM, a citizen of the United States of America, residing at Wellsville, in the county of Columbiana and State of Ohio, have invented certain new and useful Improvements in Processes of Annealing Metal Plates, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in process for annealing metal plates and sheets, and the invention has for its object the provision of novel means whereby a higher and more perfect finish may be imparted to the metal or sheet than has heretofore been possible by the ordinary processes of annealing.

Briefly described, my improved process consists in subjecting the plates or sheets to be annealed to a bath of carbon-oil for any period of time, according to the nature of the plates or sheets being annealed. The plates or sheets are then placed in the annealingbox to be annealed, and While in this box the gases arising from the oil in which the plates were boshed is permitted to escape. The plates are then removed from the box and passed through the cold or polishing rolls to impart the desired finish thereto. The plates or sheets may be passed throughthe cold or polishing rolls at any stage of heat of the plates or sheets.

In the accompanying drawings illustration is made of the steps of myimproved process.

Figure 1 illustrates the hot rolls. Fig. 2 illustrates the boshing-receptacle. Fig, 3

illustrates the furnace, and Fig. 4 illustrates the cold or polishing rolls.

To carry out the steps of my process, the plates are passed through the hot rolls 1 and from these rolls are then' placed in a bath 2, containing an oil, where they are submerged or boshed for a period of time, according to the nature and thickness of the plates or sheets annealed. After the boshing the metal plates or sheets are placed in an annealingbox 3, Within the furnace 4, and during the time they are subjected to the heat of the furnace the gases arising from the oils in which the plates or sheets were boshed are permitted to escape from the annealing-box, the latter being provided with an automaticopening valve 5 for this purpose.

While in the annealing-box the plates are securely sealed against any exterior draft of air and against danger of fire impinging upon he plates or sheets. When the plates or sheets have been subjected to the heat in the furnace for a proper length of time, they are re moved therefrom and passed through (at any stage of heat of the plates) the cold or pol-' ishing rolls 0.

I have found that by this process, due largely to the prevention of an accumulation of gases in the annealing-box, a higher polish of the metal plates or sheets is obtained, as well as producing a softer material and abetter electric conductor than where the plates or sheets are annealed in the ordinary manner. The annealing-box employed by me in carrying out the process has been made the subject of a separate application for patent, in which the same is specifically described.

Attention is specifically directed to the fact that the plates or sheets may be passed through the cold or polishing rolls at any stage of heat of the plates, which is not possiblewith the ordinary processes, which require the plates or sheets at a certain temperature before the same are passed through the cold or finishing rolls.

Having fully described my invention, what I claim as no w, and desire to secure by Letters Patent, is

a 1. Theherein-described process for annealing metal plates or sheets which consists in passing the plates or sheets through hot rolls,

subjecting the plates or sheets to a bath of oil, placing the plates or sheets in an annealing-box within a furnace, conducting from said box the gases driven off from. the oil on said plates or sheets, excluding air from the plates during said annealing operation through the attractive force of the vacuum produced by the expulsion of the-gasesand the subsequent cooling of the box, and then passing the plates or sheets through cold or polishing rolls, substantially as described.

2. The herein-described process for annealing metal plates or sheets which consists in first hot-rolling the plates or sheets, second, subjecting the plates or sheets to a bath of oil, subjecting the plates or sheets to the heat of a furnace within an annealing-box, concold or finishing rolls, substantially as delo ducting from said box the gases given ofii scribed.

from the oil on said plates or sheets, exclud- In testimony whereof I affix my signature ing air from the plates during said annealing in the presence of two Witnesses.

5 operation through the attractive force exerted by the vacuum produced within the MILLER GRIMM' annealing-box by the expulsion of the gases Witnesses: and the subsequent cooling of the box, and A. M. WILSON, then passing the plates or sheets through E. E. POTTER. 

